End bell



E. MATTMAN.

END BELL.

APPLICATION F ILED APR. 4, I916.

I Pawnase t. 27, 1921.

l NVENTOR [mil Ma 772mm WITNESSES fiwzdgima.

ATTORNEY UNITED STATES,

PATENT OFFICE.

EMIL MATTMAN, OF WILKINSIBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSEELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OFJ PENNSYLVANIA.

END BELL.

Specification of Iietters Patent. Patented Sept. 1921- Application filedApril 4, 1916. Serial No. 88,789.

To all whom it may concern:

Be it known that I, EMIL MATTMAN, a citizen of the United States, and aresident of Wilkinsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in End Bells,of which the following is a specification.

My invention relates to end inclosing members or end-bells fordynamo-electric machines, and it has for its object to provide animproved type of end-bell which may be cheaply and easily constructed.

In the design and construction of dynamoclectric machines and especiallyof turbogenerators of large capacity that are operated with a forcedsystem of ventilation, it has been found desirable to provide endbellsthat completely inclose the end portions of the machines. Such end-bellshave heretofore been formed of cast-iron and, in order to provide therequired strength, have been relatively heavy and expensive inconstruction. Cast end-bells possess the further disadvantage of beingliable to crack when subjected to sharp blows which are of comparativelyfrequent occurrence in the handling of heavy parts.

By my inventlon, I propose to provide an end-bell that is build up ofsimilar sheetmetal segments each of which may be readily formed from asuitable punched blank. An end-bell so constructed, is extremely lightin weight and is adapted to withstand sharp blows by reason of thesomewhat resilient nature of the sheet metal.

In the accompanying drawings, Figure 1 is a view, in front elevation, ofa portion of an end-bell constructed in accordance with my invention;Fig. 2 is a view, partially in section and partially in side elevation,of a portion of a dynamo-electric machine provided with an end-bellconstructed in accordance with my invention, and Fig. 3 is a plan viewof a sheet-metal blankfrom which a segment of the end-bell is formed.

A dynamo-electric machine comprises a stationary armature core member 1provided with a plurality of windings 2 and a fieldmagnet member 3carried by a shaft 4 which is rotatably mounted in bearings 5. Anendinclosing member or end-bell 6 is secured to the outer portion of thestationary core member 1 and is adapted to inclose the end portions ofthe winding 2 and to closely encircle the shaft 4: at a pointintermediate the field-magnet member 3 and the bearing 5 The end-bell 6comprises a plurality of slmilar segmental members 7 each of which isformed from a sheet-metal blank, preferably punched as shown in Fig. 3.The blanks are placed in a suitable press or bendng machine and aregiven the form shown 1n Fig. 2. Each completed segment 7 comprisessubstantially concentric parallel rim portions 8 and 9 and anintermediate flaredout portion 10. It is to be understood that theflared-out portion 10 may be given the form best suited for theparticular arrangement of the projecting coil portions of the machine towhich the end-bell is to be applied.

In constructing an end-bell, a proper number of segments 7 are assembledto form a complete annular structure. Tie-rings 11 and 12 are thensecured to the substantially continuous rim portions 8 and 9,respectively, by spot-welding or other suitable means, such, forexample, as bolts or rivets. Adjacent segments 7 are further securedtogether by spot-weldin radial ribs 13 to the abutting edges of t esegments, the ribs 13 extending between the outer peripheries of therings 11 and 12. Holes 14 are drilled through the rings 11 and 12 andthe segments 7 to receive screws 15 for securing the completed end-bellto the core member 1.

While I have shown my invention in a simple and preferred form and asapplied to a particular type of machine, it is not so limited but iscapable of general application, and it is desired that only suchlimitations shall be placed thereupon as may come within the scope ofthe appended claims.

I claim as my invention:

1. An annular end-inclosing structure for dynamo-electric machinescomprising a pluralit of similar segmental members, rings of difierentdiameters secured to the peripheral portions of said members and radialof said members.

An annular end-inclosing structure for dynamoelectric machinescomprising a p1urality of similar segmental members, respectively havingconcentric parallel rim por- 5 tions and a flared-out portionintermediate said rim portions, radial ribs conforming to saidflared-out portions and secured to the abutting edges of said structure,and rings of different diameters secured to Said rim portions.

In testimony whereof I have hereunto subscribed my name this 28th day ofMarch.

EMIL MATTMAN

